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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1fcef5adff6d7bbaf3c628bfe2af0b595f4fe629d96c90b8490018250d0d57b' 
  AND token = 'XnMcpKwkv7WWMl4408yC5A1Xa3s98pl4YMXwhtQsoTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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