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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcd8bef6dd7c62fe537163e3f23262ca4fed3175392842a4d2f25b2bc0af604' 
  AND token = 'FqBapmr0eagAT06ChMCodMRX4VSmajHpb3TGFt0Vkm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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