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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e32b03a323c9e876ac4b8843e887058bb2563332d72cfffba8317b85d6a1a5' 
  AND token = 'A3S1Pgq/EndjFfVCTfva5KIS4a7a0awDWQbsNXmZhjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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