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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102ab7ff48ac2606e2636d9899452d4f47ba61498c45e453ee0c0b9590c213ab' 
  AND token = 'q25QSJr3BeaYTrkciFLPMZuePZq9vgAbj6d2x1d2TAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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