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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa3ca48afd5f42ae7051b8ed6751e305a57a8d40679e06fc46ab5811225359b' 
  AND token = 'Pv+TQC32cTpJ0UEJ+KXFDPV55WNkfVre1/ReacWk6i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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