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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c7f2192eb9dd2dea577556e10ff5e7c5bb9914feec25f7d4f488c3ac39bc53' 
  AND token = 'Hk9MNdhodZErbi2lTTg3nIm2CZ1Snk2UTggqP+gS+Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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