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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8661ccb3dd29fee69177848d20b6b432e2e6b8eab18defb46addd22d3705d1' 
  AND token = '7p69BPMrL4kRPHYWTctfTzJHu+Bdqmmh8vGEiO2ufgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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