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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca0b4839327537f9238941ddf8698787b05749a4913fbffb8e2c14a4ce7e486' 
  AND token = 'J/Z3Hdb2vSMCAxXI/PNCSc00w+WYmm34DdV7o+Ob7hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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