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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fffe35d6262ebbe9453a41fad5e630b199853eeb1d6e0707f8960c1c5742eb7e' 
  AND token = 'z248zMKiYAJHqLVXotBpC5iDSbzQ0C1oQxTiZhbVs7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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