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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e4e1dae26a293a7a1974374c6563af9b30aafeab8b668f0bf0ba12d2372e2d' 
  AND token = 'mJJD7m0tUzxEejx4sp/Kw+l+HjnnzaCOV76PD2YVcSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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