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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcceb2101f2712207863e5b841947f750fce3730398fdc69d8de891fbc26588' 
  AND token = 'xCYImEcwWUjFb7jR6Ur0gGG+LyaK4/jHPHjiH8exxGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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