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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1b1d990d3de055c4d3123b60ce35dbc42087c37ed0b10e4545c575cafe938b' 
  AND token = '2REsxVr2AfgLQCNCSZ27p80xuqmlKSymsK46ZcgQKhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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