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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d03793253580ae240ca6cd0f628dae4d708a56f8abb4fbb3d6100952aee512' 
  AND token = 'dHeMjQvmm+7hYc6y+dZYv01HjusD6SiZ1VcYOE3ji0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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