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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb6516cd997c349decd16f0506d05d80f4759b9e29210a68936d901bfe45892' 
  AND token = 'kCu3zV97Zn1+TLL+oTIP0pyS49DsARFJ05PNWUp8L+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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