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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2315dba5e11b6b14b9819ce4630e96e19375ba957e89a74a918b7d3e51748b55' 
  AND token = 'uDy6XjABHVmaqNG93H20Ln4IFHgrbXR1N400uWQymL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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