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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc68ae593aae27e01ab8976c2006d6bd5634529b0ec010fd2e1960cb51d72f7' 
  AND token = 'Jj71fI074RUm0fXBMXXklax+gEVvjO88IHbGtyx+MoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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