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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea3cc4de3e9e353dda24de6150db0e4b03e62675741454afa377d8fd1985514' 
  AND token = 'Nw2OavzqdwaJfEJ1XsD/CqL2P4qk6/WcHJrEpnAvSGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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