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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c6c9ee415693773f32341d1de3241f417264d1807ee3772d8a87eb04c0822ca' 
  AND token = 'hp1COjnmg/hAIYNkDlvJaWunAoiIIpIon2R9H8GMaM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00232

JSON explain

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