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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7cafa8696836b414bd09d19ff46faf856e1c0c0fa2d96a1659b2a054514044' 
  AND token = 'JNETZ89DgjfjpLtkNMa4yNJl73e0+kMqa98dZoiO7lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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