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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80035514ff9b01dbb1d3983e5425562c39cbdd2a2333e30a089859eafc35750e' 
  AND token = '1HEabfs4bGAxNlISefQzXcEqm3jeYn02xCF6dvt3cI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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