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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c52c32ee32296b2051ab75a89a84b3d32aae65431379a14713ab8ea808d6c1' 
  AND token = 'iKeWa4f/dgwHNC6LEzFeYr/NMH+TyikZlwtmNx+JQQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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