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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7aadc2a53a1174b37e26899ece97b03d3d1f40ea8072c68739f500b8559fd2d' 
  AND token = 'LX4inMW2E7HEol4TZYL56Iv/qwx318x/QL45aXI/zIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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