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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9b2bb818c3609dfed3051d21662a351506850ddf2ca0f72d28463dea412d11' 
  AND token = 'Dgxs44mfTMaI3Zr4E6h82vpOaArb4rFib0TIBvA+s6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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