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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80d5feaaf28446da33eaf3a3f5e731834d6e398b156763f5361d23a5abec2306' 
  AND token = 'mpKIGVjYO5rePzYJELPbZ9PE13tgCCT4TyErQW2aEBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}