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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce16e06e905367a76b3fb0ead7f9437fbda04432517cded324a0bc90ff5103a' 
  AND token = 'bvobIsusCmevD+u6gR2dqajuyIc2JiUQ2r8NU1MKFLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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