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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68f559b2ce362c1f58901709683f2471f14061a09e019d779ebaa1fbea494f3' 
  AND token = '/ZAvtJEdbLs9bmXLxWmA9PEEVXiU+jegKgSkN/5VT8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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