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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf121eb2640293bc571ec35f488b08cbc8d15b8845aff6a7dbd302e9811cf0bd' 
  AND token = 'NLO+8ViWOAXa2/3skuG6W7Bnr1XHLrfg/Wcvv/iLh80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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