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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3a5aa226e032cf1c5f93f52e377c04d9a6fd6da2c92778ae7a4756d909c604' 
  AND token = 'ddOUL7i2yA7oPRPvfC8Kb1rRZ7OCz+/KpA4TSm/7BM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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