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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfcc3e1b3e1e25c93b273663767566c8c624129b0cc1a61546dab8bcb98dde3e' 
  AND token = 'lIR4AkbPhAxeboYs1v242qqTMPsQF6Jj2Hi14FYbrTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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