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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb773d2916fbc5ef55a789dfcdaad03e961912f064867176fa24268f2f355fa8' 
  AND token = 'CrR8mJq6hibE3Qkc9SNUCHHeiTxpzs6+Lnh0BL61KE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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