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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f0126043f8a0cd1b62ddaeb8dbe8547ba69d10d76163a4d0a8e6c7f1a67e59' 
  AND token = 'bZi4dXSJp9ERRWi0ckWJPWAsII40VEKSFYCMV+PW/Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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