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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de8d288c493e1289db59b81c227c1ee4c576991c9de53464b68b65438f465ce' 
  AND token = 'iMN1kAoDv8JHBauI2fyqJasZd/a1Qa0J1Dy63UzRS1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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