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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610b5e7ec07f491e136f9930f598006202aa917d5a3f53e2abac0c40f0f81260' 
  AND token = 'I2fzJljI8N8w1yKYeBvFLsLnpp5aousA/HoedShFXUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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