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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4b7b361bd96aed17c105fe2189c30e0fb48eb6ce27503ee28aa3145ec9921c' 
  AND token = '55gHictfXhYWoOaPOsbrFgKUCD5G9J2G4+9Xr4mJcOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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