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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b70f2303052bd24d1fa3a5738cdf6d3293b78635e8f1d33d99980b9071b2c5' 
  AND token = 'C+hGme7FRNSE1KafQjZ1r0rPJdA45DsIbllFpBAHF1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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